i had not understood the problem until he explained it.我再理解,过去完成式不应该是 had exlained

I _____ the prolem until he explaind it.A.understood B.did not understand C.had not understood D.had understood i did not understood the problem until he had explained it.这句可以改成i had not understood the problem until he explained it.这样 为什么 53.It was not until you had explained it to me that I understood i had not understood the problem until he explained it.我再理解,过去完成式不应该是 had exlained I did not understand the problem.He explained it.请用until把两句连在一起可是书上的原句是这样的：I had not understood the problem until he explained it.为什么是had not understood 呢 She seemed __what I said.I had __again.A to understand to be sayingB did not understand saidC not to have understood to sayD to have understood been said 语法挑错啊I was born on October 11,1987I and the younger brother two people My family lives in AnshanIs he older then you?I had not understood?I have not translated I have not translated 没错么？ not until的过去完成时有这样两个句子：1.The young man did not wake up until the bed had struck the ground.2.I had not understood the problem until he explained it.哪一个正确?具体讲讲原因呗. Perhaps I have understood,not to return to the past. It was not until I had read your letter that I understood the true state of the affairs.这句话对吗?一句句子有not only ,为什么没有but also? 题目是把两句话连成一句 We did not disturb him (until) He finished work.1.We did not disturb him until He had finished work.2.We had not disturbed him until He finished work.哪句正确为什么?书上有一句例句 :I had not understood ezio的遗书,求意大利文When I was a young man,I had liberty,but I did not see it.I have time,but I did not know it.I have love,but I did not feel it.Many decades would pass before I understood the meaning of all three.And now,the twilight of my I not once had left 一句话,帮忙看下时态好么If I were a teacher,i would ask my students if they understood the lessons after class要if they understood 还是 if they had understood? I could not make ----English A myself understand in B myself understood in 我想知道I don't think you understood loves not bindly accept是什么意思 I (realized)(understood)he was not telling me the truth 选择正确的词填空 I'm wrong has been to understand the original is not understood 这句话的翻译